Detachable shade-holder for electric lamps.



P. H. ROBINSON. DETAGHABLE SHADE HOLDER FOB ELECTRIC LAMPS.

APPLICATION FILED JUNE 4, 1913.

Patented Nov. 18, 1913.

WITNESSES COLUMBIA PLANOGRAPH C0,, WASHINGTON. D4 c.

UNITED STATES PATENT OFFICE.

PATRICK H. ROBINSON, OF WATE-RBURY, CONNECTICUT, ASSIGNOR TO 'SCOVILI MANUFACTURING COMPANY, .OF WATERBURY, CONNECTICUT, A CORPORATION OF CONNECTICUT.

DETACHAZBLE SHADE-HOLDER FOR ELECTRIC LAMPS.

To all whom it may concern Be it known that I, PATRICK H. Romn- SON, a citizen of the United States, residing at Waterbury, in the county of New Haven and State of Connecticut, have invented a certain new and useful Improvement in Detachable Shade-Holders for Electric Lamps, of which the following is a full, clear, and exact description.

The object of this invention is to provide a simple, convenient and effective means for detachably connecting shade-holders to the sockets of electric lamps.

The invention consists of a shade-holder having a split collar adapted to be sprung upon a bead .on the socket shell and held in engagement therewith by a clamping ring, which is carried by the shade-holder, the split collar and the clamping ring being provided with cooperating wedging elements for efiecting such engagement in a positive manner, and these parts coacting in such way that by a movement the reverse of that necessary to effect engagement, the shadeholder may be released from the socket shell and easily detached, as I will proceed .now to explain and finally claim.

In the accompanying drawings, illustrating the invention, .in the several figures of which like parts are similarly designated, Figure 1 is an elevation. Fig. 2 is a vertical longitudinal section. Fig. 3 is an elevation with the clamping ring released. Fig. 4: is a cross-section of the clamping ring. Fig. 5 is a cross-section of the shade-holder. Fig. 6 is a sectional elevation showing a modified form of clamping ring.

The socket shell 1 may be-of any approved construct-ion, excepting .that it is provided with a straight, circumferential, outwardly projecting bead 2 near its lower end. The shade holder 3 may also be of any approved construct-ion, excepting that it is provided with a centrally arranged upstanding circular collar 4 of an internal diameter to fit the socket shell 1. This collar is provided with the longitudinal slits 5, so as to separate the collar into a series of spring segments 6. Each segment has a bead 7 to match the head 2 on the socket shell, and each of the beads 7 has a bottom taper or incline or wedge formation 8, any number or all of which may end in outwardly projecting stop lugs 9 adjacent to the slits 5. These Specification of Letters Patent.

Application filed June 4, 1913.

Patented Nov. 18,, 1913. Serial No. 771,643.

segments are so constructed that they may be snapped or sprung over and into engagement with the bead on the socket shell. To secure such engagement in a detachable way, the collar is provided with a clamping ring 10, applied to it externally, and .han'in inwardly extending bosses 11 which register with the slits 5, and when the ring is turned in one direction these bosses have a camming or wedging action on the tapered or inclined beads 7 on the segments .6 such as will tend to press the segments into intimate holding contact with the bead 2 on the socket shell and thereby firmly secure the shade-holder to such shell. The relation of the bosses to the wedge-form heads is in effect eccentric in order to obtain the camming or wedging action by which .the collar is positively affixed to the shell. The bosses 11 coming into contact with the stop lugs 9, the further movement of the clamping ring is arrested; but the movement of the clamping ring to an extent sufiicient to clamp the shade-holder to the socket is not, of course, dependent upon such contact, and it is evident that the clamping ring will be held frictionally in proper position to clamp the shade-holderto the socket shell. Thus provision is made for variations in the relative sizes of the shell and the collar.

The shade-holder is released by a reverse movement of the clamping ring until its bosses aline with the slits, and then the shade holder may be pulled off of the shell. The ring may be lifted from the collar, as shown in Fig. 3, to effect such detachment. As a further security against accidental release, the clamping ring may be provided with ,a second set of bosses 12 which cooperate with the upper portions of the segments in order to bind them down upon the bead 2. This double row or set of bosses reduces the likelihood of the ring jumping the collar under strain when used with a small socket shell, and adds to the security of the hold on large socket shells. The upper set of bosses make it practically impossible for the shade-holder collar to spring away from the shell under heavy strain.

The clamping ring may have the knurled rim 13 for convenience in grasping it for operation, and its lower edge 14 may conform to the adjacent part of the shadeholder.

' Variations of structure to adapt the invention to various styles of socket shells and shade-holders, and to other structures where one part is det-achably connected with another, are permissible within the principle of the invention as herein claimed.

What I claim is 1. A detachable shade-holder for electric lamps, having a collar divided into spring segments by slits, each of said segments having an inclined portion and all of them adapted to be sprung into engagement with the lamp parts, and a clamping ring connected with said collar and having projections adapted to cooperate with the inclined portions of the segments to bind the collar about the lamp parts.

2. The combination of a part having a circumferential bead, and a part to be detachably connected thereto having a spring collar provided with beads to engage the circumferential bead, the beads on the collar being of wedge form and a clamping ring encircling said collar and provided with bosses to cooperate with the wedge form beads to force and retain the collar in engagement with said circumferential head.

3. The combination of a socket shell having a circumferential bead, a shade-holder having a collar divided into segments by longitudinal slits, each segment having a circumferential bead complementary to the bead on the shell, and a clamping ring encircling said collar and having bosses arranged eccentrically with relation to the beads on the segments to engage the beads on the segments and thereby force the segments into binding engagement with the bead on the shell.

4. The combination of a socket shell having a circumferential bead, a shadeholder having a collar divided into segments by longitudinal slits, each segment having a circumferential bead adapted to engage the shells bead and having its bottom inclining or tapering downwardly, and a clamping ring encircling said collar and having bosses camming the tapered portions of the beads on the segments of the collar.

5. The combination with a socket shell having a circumferential bead, of a shadeholder having a collar divided into segments by longitudinal slits, each segment having a circumferential head of wedge form and adapted to engage the head on the shell, and provided with a stop lug, and a clamping ring encircling said collar and having bosses to force the segments into binding engagement with the bead on the shell and having its movement limited by the stop lugs.

6. The combination of a socket shell having a circumferential head, a shade-holder having a collar slitted longitudinally and thereby divided into a series of spring segments, each of such segments provided with a Wedge form bead to fit over the shells bead, and a clamping ring encircling said collar and provided with means to engage the beads on the segments from below and theieby bind said segments about the shells bea 7. The combination of a socket shell having a circumferential bead, a shade-holder having a collar slitted longitudinally and thereby divided into a series of spring segments, each of such segments provided with a wedge form bead to fit over the shells bead, and a clamping ring encircling said collar and provided with inwardly extending bosses adapted to engage the beaded portions of the segments from above and from below and thereby bind the segments about the shells bead.

8. The combination of a socket shell having a circumferential bead, a shade-holder having a collar slitted longitudinally and thereby divided into a series of spring segments, each of such segments having a bead the bottom of which is a wedge, said beads adapted to fit over the shells bead, and a clamping ring encircling said collar and provided with two sets of bosses adapted to act upon the segments on opposite sides of their beads.

In testimony whereof I have hereunto set my hand this 3d day of June A. D. 1913.

PATRICK H. ROBINSON.

WVitnesses:

FREDERICK REUTTER, JOSEPH R. WoLFr.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

